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Background: Openreductionandplatefixationisthestandardoperativetreatmentfordisplacedmidshaftclaviclefracture.However, sometimesitisdifficulttoachieveanatomicreductionbyopenreductiontechniqueincaseswithcomminution. Methods: Wedescribeanoveltechniqueusingarealsizethreedimensionally(3D)-printedclaviclemodelasapreoperativeand intraoperativetoolforminimallyinvasiveplatingofdisplacedcomminutedmidshaftclaviclefractures.Acomputedtomography(CT)scanistakenofbothclaviclesinpatientswithaunilateraldisplacedcomminutedmidshaftclaviclefracture.Bothclaviclesare 3Dprintedintoareal-sizeclaviclemodel. Usingthemirrorimagingtechnique,theuninjuredsideclavicleis3Dprintedintothe oppositesidemodeltoproduceasuitablereplicaofthefracturedsideclaviclepreinjury. Results: The3D-printedfracturedclaviclemodelallowsthesurgeontoobserveandmanipulateaccurateanatomicalreplicasofthe fracturedbonetoassistinfracturereductionpriortosurgery.The3D-printeduninjuredclaviclemodelcanbeutilizedasa templatetoselecttheanatomicallyprecontouredlockingplatewhichbestfitsthemodel.Theplatecaninsertedthroughasmall incisionandfixedwithlockingscrewswithoutexposingthefracturesite.Sevencomminutedclaviclefracturestreatedwiththis techniqueachievedgoodboneunion. Conclusions: Thistechniquecanbeusedforaunilateraldisplacedcomminutedmidshaftclaviclefracture.